Process of cleaning boilers



UNITED STATES PATENT OFFICE.

JOHN M. BOYER, OF CINCINNATI, 'OI'IIO.

PROCESS OF CLEANING BOILERS.

SPECIFICATION forming part of Letters Patent No. 444,481, dated January13, 1891.

Application filed July 13,1889. Serial No. 317,462. (No specimens.)

To all whom it may concern.-

Be it known that I, JOHN M. BOYER, a citizen of the United States ofAmerica, and a resident of the city of Cincinnati, in' the county ofHamilton and State of Ohio, have invented certain new and usefulImprovements in the Process of Cleaning Boilers and the CompoundsTherefor, of which the following is a specification.

The several features of my invention and the various advantagesresulting therefrom will be apparent from the following description.-

The purpose of my invention is to prevent the formation of What is knownas scale or similar deposits on the interior surface of boilers. Toaccomplish this purpose I employ the following compound: One of theingredients is zinc in a reduced pulverized condition. This condition ofthe zinc is obtained by placing it in a crucible or equivalent vesseland subjecting it to a continued heating until by this treatment itbecomes so that it can be easily and quickly pulverized. The zinc inthis condition is an oxide of zinc, and is technically distinguished asthe monoxide of zinc. The zinc is then, pulverized. It is pitch, or hardtar.

half pounds of rosin to one pound of pulverized zinc, or when a liquidresiduum is used then one-half gallon, say, of turpentine to one poundof this zinc, is very efficacious. I find that any one of theseresiduums will answer the purpose. The rosin is melted and mixed withthe pulverized zinc.

The above compound cleans a boiler very expeditiously. I have found thatthis compound will in ten days clean a boiler so thoroughly that it willbe cleaner than when new. Under the operation of this compound scalewhich has been formed on the interior surface of the boiler rapidlycomes oif therefrom and resembles mud. In this condition it can bereadily blown out or otherwise removed from the boiler. My improvedcompound, when present within the boiler, prevents any scale beingdeposited on the boiler.

WVhat I claim as new and of my invention,

and desire to secure by Letters Patent, is

The process of removing and preventing scale by treating the water inthe boiler with a composition of oxide of zinc and hydrocarbon orresinous products derived from the pine tree, substantially asdescribed.

JOHN M. BOYER. Attest:

A. L. HERSLINGER, G. A. W. PAVER.

